I have a couple friends that are Uber drivers for some extra cash. It's not too bad of a gig apparently. There are also other services like Lyft and some other startups that may be paying more / giving bonuses that Uber doesn't do anymore. I would check around.

If you don't get the 2am Saturday crowd, I assume people will be relatively well behaved. Invest in a couple things though: a multi USB car charger (one with the cigarette lighter on one end and 2-3 USB holes on the other) and an iPhone 4, iPhone 5, and microUSB charger. Get the 5-6 foot ones and keep them plugged into the front so they don't go disappearing on you.

Also, figure out what the kids are listening to these days and have it. Or have a long aux cable so your passengers can put their own music on. Make sure to have the classic karaokes (Afternoon Delight, Don't Stop Believing, etc).

Those two things will shoot your reviews through the roof for the party crowd.

For the non-partiers just be nice, respectful, and if the passenger feels like talking, talk, and if they don't, put on some music quietly and shut up. Man I hate when I'm feeling antisocial and my drivers are like "so where are you going? why? where are you from?" etc.